<template>
  <div class="todo-footer">
        <label>
          <input type="checkbox" v-model="checkAll" />
        </label>
        <span> <span>已完成{{complateNum}}</span> / 全部{{todoList.length}} </span>
        <button class="btn btn-danger" @click="emit('clearComplate')">清除已完成任务</button>
      </div>
</template>

<script lang="ts">
import { defineComponent } from "vue";

export default defineComponent({
  name: "Footer",
});
</script>

<script setup lang="ts">
import { computed } from "vue";
import type { todoListType } from "../../App";
const props = defineProps<{
    //限制类型并确定接收的props
    todoList: todoListType;
  }>();

const emit = defineEmits<{
   (event:"allChecked",checkType:boolean):void
   (event:"clearComplate"):void
}>()

const complateNum = computed(()=>{
  return props.todoList.reduce((p,c)=>c.done?p+1:p,0)
})
const checkAll = computed({
  get(){
     return complateNum.value === props.todoList.length
  },
  set(checkType){
    emit('allChecked',checkType)
  }
})
</script>

<style  scoped lang="scss">
  /*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>